<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
        <script> 
 var arr = [3,6,81,4,0,7];
    function mySort(arr) {
      for (var i = 0; i <= arr.length - 1; i++) {
        for (var j = 0; j <= arr.length - 1 - i; j++) {
          if (arr[j] > arr[j + 1]) {
            var temp = arr[j];
            arr[j] = arr[j + 1];
            arr[j + 1] = temp;
          }
        }
      }
      alert(arr);
    }
    mySort(arr);
      </script>
</body>
</html>